Mounting device for vibrating tables



Sept. 24, 1963 K. A. s. KARLSTROM ET AL MOUNTING DEVICE FOR VIBRATINGTABLES 2 Sheets-Sheet 1 Filed Aug. 8, 1961 p 1963 i K. A. s. KARLSTRGMs-r'm. 3,104,868

MOUNTING DEVICE FOR VIBRATING TABLES Filed Aug. 8,- 1961 2 Sheets-Sheet2 fiZZE 25 United States Patent MOUNTING DEVICE FG R VRRATING TABLESKarl Axel Sam Karlstriim, Gavle, and Karl Gustaf Gstberg, Rotebro,Sweden; Ingrid J. C. Allard and Elsie A. M. Gstberg, sole heirs of saidKarl Gustaf fistberg, deceased, assignors to said Karlstriim Filed Aug.8, 1961, Ser. No. 130,126 Claims priority, application Sweden Aug. 15,1960 4 Claims. (Cl. 259-72) The present invention relates to suchvibrating tables, especially intended for dental use, in which thevibrator is rigidly secured to the table so that its vibrations aretransmitted to the table and through this to vibrating objects placed onthe table. The invention has for its object to provide a device formounting the vibrating table in a holder in such a way that the wholetable may vibrate without the vibrations being damped appreciably by theconnection with the holder. According to the invention, for this purposethe table is adapted to be secured to the holder by means of twomounting flanges extending from the table and forming a resilient clampenclasping the holder. The mounting flanges are suitably made integralwith the table which preferably con sists of a piece of resilient sheetplate whose opposite end portions are bent over angularly to the tableso as to form resilient flanges enclasping the holder in a resilientgrip. For placing the table on a base the holder is suitably formed as ablock or the like of rubber or some other resilient material, theresiliency of the holder permitting the table to vibrate without beingdamped appreciably by the holder. In order to reduce the damping effectas far as possible, the mounting flanges are adapted to engage theholder at their" outermost ends only, the edges engaging two recesses inopposite end faces of the holder.

The invention is illustrated in the annexed drawings. FIG. 1 shows anembodiment of the vibrating table and the holder in perspective. FIG. 2is an elevation and FIG. 3 is a top plan view of the table. FIGS. 4, 5and 6 show another embodiment in top plan View, and elevation andlongitudinal section, respectively.

The vibrating table comprises a rectangular resilient sheet plate 1,suitably of stainless steel, whose end portions 2, 3 are bent downwardlyso as to form in unstressed condition approximately right angles withthe plane surface of the table. The table is carried by a substantiallyparallel-epipedal block 4 of a resilient material, for instance rubber,by means of which the table may be placed in a horizontal position on abase. The table is connected to the block by the flanges 2, 3 formingtogether with the table-top a spring clamp enclasping the block, theflanges engaging grooves in the opposite end faces of the block withtheir inwardly bent edges 5, 6. The table is mounted on the block bybeing pushed down over the same, the edges 5 of the flanges firstsliding against the bevelled top portions 7, 8 of the opposite end faces9, 10 of the block and then along said end rfaces until the edges 5, 6snap into the transverse grooves in the end faces, whereby the table isfixed in a position above the top side of the block and parallel withthe bottom surface of the block. The length of the block is adjusted insuch a way that the flanges 2, 3 make contact with the end faces only byway of the inwardly bent edges 5, 6 while the rest of the table iscompletely free from the block.

The vibrator is of the kind in which the vibrations are generated by aroller body enclosed in a tube 11 adapted to be driven from a flexibleshaft insertable into the rear end 12 of the tube, the vibrations beingtransmit-ted to the tube 11 and from this to the table 1. In the embodi-Patented Sept. 24, 1963 v fits in said openings without play but with aslight sliding fit so that the vibrator may be positioned properly inrelationship to the table. When the table is then placed on theblock andthe flanges 2, 3 are put under tension on account hereof, the vibratortube 11 is locked against .the edges of said openings at the same timeas the horizontal part of the table is applied against the vibrator-tubeby the spring force transferred from the flanges so that the vibratorbecomes rigidly joined with the table. Thanks to the connectiondescribed between the vibrating table and the block 4 and by virtue ofthe resiliency of the block I material, the table as a whole may thus beentrained in the vibrations of the vibrator without the vibrations beingdamped appreciably by the block. To attain this effect,

the block need of course not be made of resilient material throughoutbut it is sufficient if the edges 5, 6 engage in resilient portions ofthe block.

FIG. 1 shows how the vibrating table may be used for vibrating e.g. animpression spoon 13. The spoon is clamped to the table by means of across-piece 14 and two screws 15, 16 having nuts 17, 1-8. The screws areintroduced by their heads 19 through holes 20, 21 in the table-top andare then displaced along the underside of the table through slots 22, 23extending from said holes, after which the nuts 17, 18 may be tightenedagainst the orosspiece 14 while the beads 19 of the screws engage theunderside of the table. The impression spoon is secured to the table byarms 24 extending from the spoon being clamped between the table-top andthe crosspiece 14, in doing which the arrangement should be such thatthe impression spoon is simultaneously pressed against the table withits lower side. In order to prevent the nuts 17, 18 from looseningduring the vibrating process, they should be provided with a nut-lock ofsome suitable kind.

In the embodiment shown in FIGS. 4-6, the vibrator 11, 12 is insertedwith a close fit in an opening in the rubber block 4 which has in itstop side a longitudinally extending recess 24 which lays bare thevibrato-r along its vibrating end. In addition, the block is provided atone end with a wedge-shaped recess 25. In other respects the block isformed and intended to be used in such a way that is described ingreater detail in Patent No. 3,081,980 granted March 19, 1963. As inFIGS. 13 the table 1 is provided with mounting flanges 2, 3 which formtogether with the table a resilient clamp by means of which the tablemay be mounted on a proper level above the block. The necessary firmcontact with the vibrator is accomplished in this case by means of anumber of pins 26, 27, 28 which are secured to the table along itscentral line parallel to the mounting flanges. When the mounting flangesare forced on to the block their edges 5, 6 slide against the end faces9, 10 until they snap in below the corresponding end edges of the blockor into grooves in the end faces of the block, the pins 26, 27, 28 thenarriving into abutment with the vibrator tube 11, 12. At the same timethe table is slightly bent about its centre line so that the pins areoffered against the vibrator tube with a resilient pressure. After thetable has thus been fixed in its proper position the resilient pressureon the pins is maintained by the bent-in edges 5, 6 of the mountingflanges enclasping the end face edges of the block or engaging intogrooves in said end faces of the block. In order to facilitate securingof the table to the block, the end faces 9, '10 of the block may bebevelled as shown 'at 7, -8 in FIG. 2.

The impression spoon '13 may be secured to the table by means of screwclamps or any kind. In FIGS. 4-6 two screw clamps are shown eachcomprising a caliper 29, which may be clamped by means of two screws 30,31 to the edges of the portion of the table that has no mountingflanges, and a cross-piece 32 which may be adjusted in various positionsby means of nuts 33, 34 for retaining the impression spoon.

What is claimed is:

1. An improved mounting assembly for dental vibrators comprising; ablock-shaped holder having a longitudinal axis; a tubular vibratormounted on said holder; a vibrating table mounted in vibratory contactwith said tubular vibrator and being vibrated thereby; connecting meansfor detachably connecting said vibrating table to said holder andtubular vibrator Without appreciably dampening the vibrations of saidvibrating table, said connecting means including a holder clampingdevice, said holder clamping device comprising a yoke-shaped clampingmem- :ber integral with said table and having elastic flanges arrangednormal to said longitudinal axis and tensionally enclasping theblock-shaped holder at opposite sides thereof, said flanges beingslidable longitudinally to slide 3. A mounting device as claimed inclaim 2, in which the vibrator is held in lengthwise engagement with theunderside of the table.

4. A mounting device as claimed in claim 1, in which the vibrator isresiliently mounted inside the holder below the table, pins secured tothe table and passing through an opening in the holder being arranged invibratoryv contact with the vibrator.

References Cited in the file of this patent UNITED STATES PATENTS2,255,799 Meinzer Sept. 16, 2,447,712 Nathan Aug. 24, 1948 2,546,806Wenander .4. Mar. 27, 1951 2,728,562 Bailey Dec. 27, 1955 2,757,908Broadwin Aug. 7, 1956

1. AN IMPROVED MOUNTING ASSEMBLY FOR DENTAL VIBRATORS COMPRISING; ABLOCK-SHAPED HOLDER HAVING A LONGITUDINAL AXIS; A TUBULAR VIBRATORMOUNTED ON SAID HOLDER; A VIBRATING TABLE MOUNTED IN VIBRATORY CONTACTWITH SAID TUBULAR VIBRATOR AND BEING VIBRATED THEREBY; CONNECTING MEANSFOR DETACHABLY CONNECTING SAID VIBRATING TABLE TO SAID HOLDER ANDTUBULAR VIBRATOR WITHOUT APPRECIABLY DAMPENING THE VIBRATIONS OF SAIDVIBRATING TABLE, SAID CONNECTING MEANS INCLUDING A HOLDER CLAMPINGDEVICE, SAID HOLDER CLAMPING DEVICE COMPRISING A YOKE-SHAPED CLAMPINGMEMBER INTEGRAL WITH SAID TABLE AND HAVING ELASTIC FLANGES ARRANGEDNORMAL TO SAID LONGITUDINAL AXIS AND TENSIONALLY ENCLASPING THEBLOCK-SHAPED HOLDER AT OPPOSITE SIDES THEREOF, SAID FLANGES BEINGSLIDABLE LONGITUDINALLY TO SLIDE SAID TABLE ONTO AND OFF THE HOLDER.